Sewing-machine bearing.



PATENTBD JUNE 18,1967,

u W. s. RBSBR. SEWING MACHINE BEARING'.

APPLICATION TILED 00T.19. 1906.

' To @tilt/hom t fine-g.; con-cern:

full, clear,

'bed plate of a sewing machine having my the-upper =end thereof.

Unir-nn. srArn-s PATENT: OFFICE.

WrLLrAM s.. enses, or DAYTON, orno, AssIeNoR or `oN Efrnmn T o ernennen einer, l namen, cnrs.-

No. s 5 Y,- 5er.

' 'rippliasnn'nea oq-tuber 19,.,19oe. srialjnm esatte.

vievgin sectionsA showing the beariIngapplied` to thefshuttle lever.A l 5" In a detail desoriptionofthe similarl reference" characters sponding parts. fThel-hanger. or

. Be it known that I, WILLIAM S. R'nsnn, 'a citizen of the United States,.re sid`ing at Dayton, in 'the-county of'Montgomery and State of Ohio, have invented certain neW 'and use-l ful Improvements in Sewingllachine Beatz ings; vand I do declare the followin to be' a' and exact descriptionof t e inven- I vvtion,'s1ich as Will enable others'slilled in the.' art to 'which it appertains to make and use the same, referencebeing had'tc the accom-- panying drawings, and to the letters and figures of reference marked thereon, Which'form .a part of this stpeeiiication. v

This invention relates to sewing machines and more particularly to the mechanism of av seeing 'machine which is 'instrumental in imparting movement tov the. shuttle.

The -object'of the invention is. toprovide mean rcentering thebearings of thehanger ttle lever and which may'. be 'ring adjustable anti-'friov fore Y tapered screws sed for the bearings of and owing to the'fect that it is which the bearingto be described is mountin leaves 3- between which theI eccentric .4' rotates and inipartsoscillating :movement to furtherv description.. understood has a pendulum movement and its ulcrum is oir two balls i6. The 'hub 7 of seid'lever 'isprovideclwith alined recesses .,8 which `extend into the huh a suitable djs.- `tanoe so' Ythat the Contact" between 'said hub and the balls is reduced to a inininnirn. It

Contact v vith the. en 8 es in, the' case of these parte, cup. This is importent for the reason-that Y invention, l l indicate corresewing machine construction and requireno" The lever 1, lit will be' .is essential' that the balls shall. y.not make-,`

tire surface of the recesses'-. the; ordinary bail seat or V lever lfis'inclosed'in tlie f -upri'ght portion-2 of the' machine arm .in-f

' 6o ed.' The upper' end of said hanger terminates impossible to obtain a perfect center and a' the balls Innst be heldstationary or-mustfnot-J' perico bearlng'ivitn snch devices, more dit 'naves movement independent of the lever;

this is accomplished by ssgrioping contact' between the 'outer cireum erential edges -of 'said lrecesses and the ",tionof the inolosed surlece 'free from metallic Contact tact with the hub. The n. lever l is constructed is' essen the balls; there .is b alle a surface more are the balls themselves, harflrened steel. Owing cult;r has been experienced with sewing inachinesin constructing these parte than-any other parte ci the machine; it becoming nec essary to constently repair or change such' bearings after-the machines have been' placed .in in. to lieve thini-niaintain even an rinerrfect e-ljnstment. caseoi the re "z invention the hanger- Will f always ...in a true, center end perfect bearing .e weer incidental to continuons move o. a 'minimum and can be necessitating the throwing anti n. inent'is reduced t taken up Without of the hanger fork or any other part `out oi thusbrought in contact alillernent. v

Preceding a detailedl description of the in vention, reference is made to the accompeny--l l ing drawings, of which-M y i r'nove in unison or to Fignre' is side elevation of an arm and l letion of said. lever.4

balls engage in. a similar :manner the' circurnferential edges of rec into centering screws 9 constructed of har denecl steel. 'Phese centering screws, owing recesses 8 and the balls 6 gether dering the oscil l perfect selicentering bearing applied. Fig. 2, is an enlarged. sectional view of a portion of the arm ofa sewing machine showing the I hanger supported and my improved bearing. Y Fig. 3, is a detail view of the hanger showing' Fig. 4, is a detail to that of th freely inthe the major por-. .1 the balls being or free from' oon ,tal of Whichl the. tielly'softerthan thus presented to said` susceptible to' Wear than which are formed of to this diferen'ce in,A tlreohiracters of 'theitwo metalswhioh are there is agripbe-l. ,tween the outer circumferential edges oftheas befor'e'indic'ated, which compels the .lever and the balls tof vThe outer sides .of the i' esses 12 extendingleo.

to their being constructed of :metal similar n e balls, enable said balls to turn ends ofthe screws while I noving4 4 with `the lever as before indicated. Regardless of the position of the lever, a truecenter and a proper bearing are thus maintained between the parts, The centering screws 9 are provided with openings communicating 4with the recesses 12 and through which oil may be introduced to lubricate the bearings. .In Fig. 45' the saine idea of means is shown applied-toa shuttle lever 14 which is oscillated from the hanger lever 1 through the engagement of said shuttle lever with the hanger lever below the bed plate 415.l .Pro-

jecting from the underside of the bed plate.

1s a bracket 16, the lower arm. of which supports a screw 17 which is screwed therethroug'h and is maintained in 'position by a 4 'am nut 18; this screw 17 is constructed of contact` 'recess 12- extending inwardly from the ball,

the outer circumferential edge of said recess alone making contact with the ball. The hub 2O of the shuttle lever is suitably reeessed as at 8 on each side togpermit of the 'inner sides of the balls being engaged only by the circumferential edges of said recesses.

Any undesirable looseness of the bearings `may be taken up in either case by a slight adjustment of the centering screws 9 -and 1? without changing the-centers of said bearlngs. i

'Heretofore, much diflicnlty has been experienced in grinding or preparing the work-l lng surfaces with the eccentric 4, and 1n many instances the hanger leaves for'contact 4these* engaging surfaces are not true 3 as a consequence, the eccentric imparts to the hanger or lever 1 an uneven movement. This difficulty is quite overcome by the present invention which enables the .hanger to be rst properly centered between the two balls make these openings in exact alineinent.

before placing it in the machine, to deter-- mine the exact point of contact between the eccentric and the leaves; and further7 much i f'li'fliculty` has been experienced in locating the openings in the machine arm 2 for the centering screws, it being very lilleult to As a consequence, the centering screws themselves will often be out of alinenient and will cause the trouble and annoyance 'of an imerfeet bearing. By the use of the devices lierein shown and described7 these dil'lculties are obviated and' a perfect bearing andrentering means regardless of any variation in the posiions of the centering screws or the hanger recesses, is obtainable.

I claim: g

1. .ln a bearing of the ltype specified, a lever, said lever having recesses on opposite sides of its fulcrurn point, a centering screw on each side of said lever in alinement with said fulcrurn point7 said centering screws having recesses, and a. ball between each centering'screw and the adjacent portion of the lever, said balls being engaged on their opposite sides by the circumferential edges of the recesses in said centering screws and said lever, the portions of said `balls lying within the circumferences of said recesses being free from contact wit-h the screws or the lever.

2. In a bearing of the type specied, a lever, a centering screw on each side of said lever, a ballinterposed between each of said centering screws and the lever and forming the fulcrum of the lever, said balls 4each engaging 'on one side the annular rint only of a recess and having the portion of their surface lying within the cirm'mference of said rim free from metallic contact. l l .ln testimony whereof I affix my signature, in presence of two witnesses.

y VlL-LIAM S. BESSER. Witnesses:

C.-M. THnoBALn,` fR.' J. McCaRrY. 

